I'm noticing a weird thing between my Sandbox and Production account: when I run a Saved Search on Item Fulfillment records and look at the Line ID, I'm not getting the same value between accounts. In Sandbox, the Line IDs read as 0, 1, 2, etc, but in Prod it's reading as 1, 4, 7, etc, as if it's in multiples of 3. Has anyone seen anything like this before?

always multiples of 3?

There are Item Lines, Tax Lines, COGS lines.